PHP Fatal error: Uncaught TypeError: join() …

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Getting PHP Fatal error when trying to save plugin settings with 0 (zero) checked plugins.

PHP Fatal error:  Uncaught TypeError: join(): Argument #1 ($array) must be of type array, string given in .../block-specific-plugin-updates/includes/bspu_plugin_select.php:3

Block Plugin Update 3.3, WordPress 6.4.2, PHP 8.1.x